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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60ebf03ffebaec3c1af716f4d7c695df2ecd6c1428613d94a308e46a0ba5196' 
  AND token = 'elt23eJVuB1XGxPXuso5TNV9EwP/MgMHlGhcI3OwGFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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