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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a8cccca53567aa4425a7b750323854dfb6e45d39c1e954b1fce06c21014af2' 
  AND token = 's0Ua7NLaQ8GkQwyoRgSlHn7w9P30hyZ3naz4VhQ0F38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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