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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4924f16d7083164ff8d8d1a97a11661cc6cae2af818d6bd45f11f0c4077e6051' 
  AND token = 'qYmOu0SlR+G3sO7Je5FHZUQx48oU8Cq1qmaYkHk3Jjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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