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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78bf9a92f541293449c3c27af7519ac6eb640afee484d3e1d5e5b01d9ae59f2f' 
  AND token = '09ReX1l22MyiHp87ieReWGN0TGgDYyK+kGQks+JNlmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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