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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301e0d55df884431b5cc652ddded49798e931d6c49fdbd7d5d46286541788e9b' 
  AND token = 'lMfJ7JqB8joIKUAlPoqaRYFGok2bJUElR9NgmYCvygU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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