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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4520dadde062154789ab787647fa63b38b6feccb5d8a2fc95f4241268501fda8' 
  AND token = 'NHvAEtDXkZ0LtF954ofLZC6tT6/xRFZhzhbYKkS9bGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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