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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2360e8f43398c8449547ac7328e6d3cdc9914a85d76d5acadddce8ea0f8c261f' 
  AND token = 'USFW0EKtnO51pjxIIBl/mpyx5Jx/oIFk542QnM+fBk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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