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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09693845494884b7590144fb98ed9a4a8fc7c2bcc7b95f286e16e2e21ef3615' 
  AND token = 'OwUjDRp32O5WbCD3uG37WOU+C2TiX5/zV+MrjdG6dJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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