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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91028f83a4f51d07aecd9865bdcdd743f5c742533453386fdba9cc2c1d574dcf' 
  AND token = 'O8UB/CsbETfNKRu9USOL8qF8rhhIzbQiiv7/dHEH+f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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