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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1802319c4e72f9d8283dc772b890c30e337829a27914419f55270e7eb5886ccb' 
  AND token = 'MvE7aMHTfGUiCWNEoKVgLr+3LLLEVQVs+/xQTLs19Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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