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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dab6218e9f3cde14fb6c2af8dbe604d06a287e77ae3fae910bcc8ffbafe0b1d' 
  AND token = 'PqI5lb0vr6XeZlmJ1Z9FtkghnqkAOBrTl0qBea8CMrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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