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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a5db70c935679c27afcc338337c20669e2f006c607b09de4c463a9652c7c0c' 
  AND token = 'W/kx1Mbahpmt0eJdmLvt7o/Z/6jzWHZeXGejZp6sDYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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