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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837e16161a64d56c0d2e78269e2707495a6b78eeb40aff122e810b66d70f1b47' 
  AND token = 'NQ1+W3lIcxoa+0LksPemozcTl8gevw9YGkqA+7/0Lc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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