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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e74ee9828297e216f8a1bca03ad5e468aa90407ac15d3c3b949113436bcb9bb' 
  AND token = '4cVZpCUI89k1b2qw4v0pkAgPErrKawn+ZiKcwNs7nwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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