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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35eb41d8f725f2ec90a4bcad4af7afd605c3bc78763c00cbef56aac809ec4b5' 
  AND token = 'cRhL/8WpDxGHhGPF4M8B4n2n1drbUpJdgzseuqAkyVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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