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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a58b6f4a0a509b3ba26182c6758c2bd8f72638d6a79118f15fefc5b80b60211' 
  AND token = '99KmrZVjeavJMmtgRX0i4dTw8JjZRvVuThe2hLXAFMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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