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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8918ef2237db9de2b3f32664cf208085b387aee7045eebeb8e001b736f960b7' 
  AND token = 'oAfpy8MdQkThKBa0bP71ssrGEochvN4gr6Nmhmokbzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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