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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238dac8c4dcd07b0bd6c82a9d3dd0bcc17fc29631460060763c94dcac3e4589d' 
  AND token = 'rdhUr56Te6+oSHng2qbT9JB8LktkV2eThtYvGVxHBa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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