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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '181925ccb2ba8d3aa680460565fd08148a92f7b01ede66f5192a9111db0f03ea' 
  AND token = 'xQRMoyBL4+F7NtxAbKtaRk9CPE62bLtxculq4Uti9T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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