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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2629156f82f869ab4729e0ac8520e6f4106f853d15290bccc33d592177ce790' 
  AND token = 'AB9TAHSIG+UGVOMR9mix8jW9YSha8J1TfcWGJCpnI2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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