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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb619e0861c846aef42cecbbf711e0c00d095d99401328e7ba62a0048fb36e45' 
  AND token = 'Tnl44HzuIIglBF3V54403lWZkr13mFklBjQ76sOwLTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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