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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6acbfcb75ff4ba7279c6d07b34682544202cab26ee08fdbd4ad675fbd93529' 
  AND token = 'J9PK7OmqeSz6OM437f02qWIMnDkrP31+jN7mMQ8jiE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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