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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ae0715962bcae138ffa8a865a4907d8d9c0f9d6f88b3681208c7c91abd9e2a' 
  AND token = 'Nff7JetKYVKIl39o7LY7TOmKq4u8UzvnjN0mJMDoZOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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