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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616719a04b1070d9c017be7f31c010db7acec11c1a2395c2cc1ef8ce5aabc313' 
  AND token = 'hosEUZZlLllQeIrO4m3hLYClNV2xJypdGq19HkZHmbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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