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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0360a4894b2d027cfe1b9d92fbc682c88ffade5584b9a64cee84096726914531' 
  AND token = 'nbiHF9Oe0Js8SchcfqlHiaHAwnLsBj+pt+/dlsfinVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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