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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bc26056807e8691abf55e04b4596af76df322f458c61c06c492c084a8308fc' 
  AND token = 'i/DSi4RKriWmD5jz4xzE51tHdv4SZiX6AW7qHjSgRf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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