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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea69f48359265a9d076bdfd6fc54aadcfa26c6f7eb432423ee1729f5a36e843' 
  AND token = '3iLvTQizd4ZRweDec59JgaiqpaHVZgOoZexC9BJmMI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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