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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1d1e2d31f8c9c0f4b8daef47f76e9872c2a77a6a6ece35def44757d281e34f' 
  AND token = 'r14/XgMpzJ1BfURaDemnp8DZxEh8pn0T47BpAxOxRYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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