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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b3c5759796a106e4708e5901cf9b03d4c1afe040cf278e8091199d93304a3c' 
  AND token = '3wZnk4Y+2bYf9xOrPpvNq/gRrhhp/Av6RMl/Y9qgJnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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