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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a91d7eb389c67c0c6abb4b3c4b82f674a42b9f05f4956d9b9a9a483b477e01' 
  AND token = 'L8IO7S/qibH91hQl269/T2SUkY29xSoaRnZN7Ajd0aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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