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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c5a0848b5f442d7ece1f9f018a27a0e7e87960b63978c9a2783ee06cbf62b6' 
  AND token = 'g4WygJSaMbqsu9mGFlALX8VbpG3Qgm/+tEybXMIxLSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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