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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de6b8d4e36965654033dab4084bcf032a2a8f3fac8dd9ed45d1ca088503a981' 
  AND token = 'O7tCK+R6UY+dsYNwJmk7ICORachhoDe7SdMziz9IvGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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