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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8e62509e08d3f66d43fef4aad75c100fe95d4f6885000b68b5a824aed1566c' 
  AND token = 'ncOsR+KNnnfmJQBhc6Hckxqkd+OgMDQ56/T+a3doACE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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