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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7d026e6c872bf9a23467e0b8d9260eeb1238b01801b223e0206d9f4abb9684' 
  AND token = 'HKmIYP7SPXeij+erijD0Y6Lz16vhiQsaeC93gARdN8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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