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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59848da511d17c247ba639d4b52055e8c5eb77361ae8f1e97a412e9b7f20df4' 
  AND token = 'tIT3MewPSjpop4gJMLMW741jtModJA8hnvFp7r+kBWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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