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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbe1106314980a5434a757e01391bbf00b015b64c23f53f1ae1d4dd71cd5972' 
  AND token = 'ZvzRFrbRUv+zf8QukENXuBAn+XItOV81PO4C4XTlLWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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