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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9b24a1def515a013db447d93ab2a3619fcfed819e9e65914da0812f829203e' 
  AND token = 'Wp3WUABOqk/HcBTZGf/jCWss9FggTg34qdqeHGuYtJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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