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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fe5f6313cc02ffca786fd30edae533a57a9662c4693e65725f08ca196628a3' 
  AND token = '6ITpI4Nxpk96dJxcetBhTws+jC6pGc5qZ+JFiUOJkK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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