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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf5d59e1eda01216d9ad64906c2d134bb8f36c723e7f8cdd9150393cc193af0' 
  AND token = 'ITxmGLlJQ5Z8XmMRb0DROopHGMWDJhRCK5qfAKGIG7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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