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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85baceadecb81c9b13ca3a4ec4bd2cfa9f6222dd1a5120ec6ecfe05cc2d1b359' 
  AND token = 'YSAOuXzlzgewwZaC2be1tAfF3LF69p2XVHmoRsTKIww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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