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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44905e75bcb6f284051a95cddda68dc49b898fb9e230ee812f53a7a1c27c0422' 
  AND token = 'JDzOwdkJ90i8HM+eQsUhXDenQ6Na9ujci4mGexiC06U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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