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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072514ac7c308beea38d4dc3b07afc962c65314074d7ff37b05680a3cb8a761b' 
  AND token = 'TOTNnBM0skl3DbvzPqO0yZxD/QaFiK4khHa3DMhrjA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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