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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018618cf0a000b8ad1400b0e750114b9503e06921077c9068a18d10ccc7b58ae' 
  AND token = 'bqdI2oNuUidHgNbKRFmPPBNFV+ku5OiftqK7Oog8qZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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