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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad409613e540398538710c4143dc8c6caa37f31c44aa2aca76bc39f520c5fb9c' 
  AND token = '3N7IkKLaDFDwaBrLhqrqhQW/Gx238O+DaOIWI3ostbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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