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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcad7e038fc0bbf780b424e7e70aba8aa6cec6d52fa5aa5eb619df04522cfa7f' 
  AND token = '3G8jk8GR//hBk2BLrCbQjPBgb2sMVX7M2CjalNc5KQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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