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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c55670a53aace2c10dbdfb37645ac7b7f08787eb09ed9ca82281da50781cc04' 
  AND token = 'tyfnyKC+bZA5ude7CAeEkmQrMbGWJioGjz6R6iAxxzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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