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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fadf77761487770aca063f632196c3782f31926009e6fcb716a7b277ccf6ec' 
  AND token = 'VGLPbAkb06poNBxho0qZKXfq1ZzYaHXZMgny2q3IY9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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