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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68f11035980171b2a8d130966c84e45aff6c2a94b1ee01526af3dd4cf5e5a30' 
  AND token = 'L9v6iCxhBSrzvBpqV1TXZXZTShNmQ4bodIvXx7imB8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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