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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94210efa8636bc5c37fd98dd2ce56261d3532a8b25f874a60fe6984a3744bc2b' 
  AND token = 'kArrZlIWYvTLKrkceF7nj7PpmEE1p4ab8TkGcChrmrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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