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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380db4880ca9bb68fa1aa959942dbe311dba3eef2bfd4d3c5f10f76f8fd43592' 
  AND token = '7XRn3v8hL29ftMfijsceB1/Ieki0fsH5A2kOqSBVGN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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