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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcedc3bdfcb9c15c4d7b700dfe8d265022bf7a14b8c5cae95d5e99df7bbe92f' 
  AND token = 'ZAsNreg0AQITD5GOaZ+vsU2KGVcgqGUYGPAMSNgS/Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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