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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719d8db4f37eb3640ceb6cbb5edd7f69f3b800f9d8b77daccee0f9a5efa2a0e2' 
  AND token = '7dK4Sh3jv1pL8i2b98pIgBwJ2JinnQzjuiN4bSLFO9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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