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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7052183e47d922b3447c69fd66f855cad240051dafe4f8a9262ef5a6a2e1701e' 
  AND token = 'NDoNiVkQxCFa4Anwptgc+jGNatuHeuUoJP4B8W+SvpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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