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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4f4d3c9744d26824455f084ef1b5c64e82c90d536aea91cd4541a62838027a' 
  AND token = '2Fw6RUMwObRbdIzcNkevp5pn8N8EfO2Wq0lvhG8Lrwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}