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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88eaa772149d6bb3114acc82a48cc1c5ec1ccbeea52c8ac32ad96ee6437f25c4' 
  AND token = 'B9EEMmvcWmSZorZl/tx1o0utGJ/pEtvh4ye2Aqb4RUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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