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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912c9913e9f1f5f857cb578497735b3ff55f0b7fd9271391a69bd5ab7f648e40' 
  AND token = 'vZXfgjeYhQc+sllJSfNssSFEbcFrazlyv0j4knMmI8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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