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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef97b257d36d156f38e1a2fdaf76e3de8c2d97d1a3ee630ea5bb8cec04e6a38' 
  AND token = 'fI2iGTIDPRCY04d+5w5kIuTCsNVvOcIhrlXaog/scZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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