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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b05af802efdace29fc85d8933848bd2ccbb3e51bea4a5eb8b402c1cfe1f0cce' 
  AND token = 'l4DoOCjc2As05gq+sAEOhZxtIQMUw3h1tdqszameWmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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