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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945aeacc3963548a2dc49fa043b8ac34e4679c657414ad3194c064a579c9d3fe' 
  AND token = '58iuKewT8wZzEXIOvyqjSxd2T+eJ8lCXXLnqY1OdSsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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