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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd977a9480e6d070151492e2dd9052e20816380e159a6ae7714326d7fd9586962' 
  AND token = '08eJ8fGyp3PpVbMYCgH2+UmrUCRwN3EE8nYV0M5F9IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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