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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a7e4edd94dbbcbb615937c90238cd2e5a18db536b0da3d1ef5cff2b6f1e57e' 
  AND token = 'k74zYtm7NW3CckvBPLn3HUugarq/b8EyHaTdpqI+9O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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